{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\hline
S=1 $\times$ T=1&    0.028         &   -0.023         &    0.082         &    0.015         \\
                &  (0.076)         &  (0.089)         &  (0.074)         &  (0.088)         \\
S=1 $\times$ T=1 $\times$ electoral\_period=1&    0.152         &    0.170         &                  &                  \\
                &  (0.118)         &  (0.141)         &                  &                  \\
S=1 $\times$ T=1 $\times$ term\_limit=1&                  &                  &    0.035         &    0.079         \\
                &                  &                  &  (0.122)         &  (0.150)         \\
\hline
Observations    &     7077         &     7042         &     7382         &     7347         \\
\(R^{2}\)       &    0.263         &    0.271         &    0.257         &    0.264         \\
\hline\hline
\end{tabular}
}
